doc: clarify cjs and esm scheduling difference between queueMicrotask() and process.nextTick()

doc/api/process.md

@@ -3020,34 +3020,40 @@ function definitelyAsync(arg, cb) {
 
 ### When to use `queueMicrotask()` vs. `process.nextTick()`
 
-The [`queueMicrotask()`][] API is an alternative to `process.nextTick()` that
-also defers execution of a function using the same microtask queue used to
-execute the then, catch, and finally handlers of resolved promises. Within
-Node.js, every time the "next tick queue" is drained, the microtask queue
+The [`queueMicrotask()`][] API is an alternative to `process.nextTick()` that instead of using the
+"next tick queue" defers execution of a function using the same microtask queue used to execute the
+then, catch, and finally handlers of resolved promises.
+
+Within Node.js, every time the "next tick queue" is drained, the microtask queue
 is drained immediately after.
 
+So in CJS modules `process.nextTick()` callbacks are always run before `queueMicrotask()` ones.
+However since ESM modules are processed already as part of the microtask queue, there
+`queueMicrotask()` callbacks are always exectued before `process.nextTick()` ones since Node.js
+is already in the process of draining the microtask queue.
+
 ```mjs
 import { nextTick } from 'node:process';
 
-Promise.resolve().then(() => console.log(2));
-queueMicrotask(() => console.log(3));
-nextTick(() => console.log(1));
+Promise.resolve().then(() => console.log('resolve'));
+queueMicrotask(() => console.log('microtask'));
+nextTick(() => console.log('nextTick'));
 // Output:
-// 1
-// 2
-// 3
+// resolve
+// microtask
+// nextTick
 ```
 
 ```cjs
 const { nextTick } = require('node:process');
 
-Promise.resolve().then(() => console.log(2));
-queueMicrotask(() => console.log(3));
-nextTick(() => console.log(1));
+Promise.resolve().then(() => console.log('resolve'));
+queueMicrotask(() => console.log('microtask'));
+nextTick(() => console.log('nextTick'));
 // Output:
-// 1
-// 2
-// 3
+// nextTick
+// resolve
+// microtask
 ```
 
 For _most_ userland use cases, the `queueMicrotask()` API provides a portable